Motion in a Straight Line
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Question : 1
Total: 27
In which of the following examples of motion, can the body be considered approximately a point object :
(a) a railway carriage moving without jerks between two stations.
(b) a monkey sitting on top of a man cycling smoothly on a circular track.
(c) a spinning cricket ball that turns sharply on hitting the ground.
(d) a tumbling beaker that has slipped off the edge of a table.
(a) a railway carriage moving without jerks between two stations.
(b) a monkey sitting on top of a man cycling smoothly on a circular track.
(c) a spinning cricket ball that turns sharply on hitting the ground.
(d) a tumbling beaker that has slipped off the edge of a table.
Solution:
(a) The carriage can be considered a point object because thedistance between two stations is very large as compared to the size of therailway carriage.
(b) The monkey can be considered as a point object if the cyclist describesa circular track of very large radius because in that case the distancecovered by the cyclist is quite large as compared to the size of monkey.The monkey can not be considered as a point object if the cyclist describesa circular track of small radius because in that case the distance coveredby the cyclist is not very large as compared to the size of the monkey.
(c) The spinning cricket ball can not be considered as a point objectbecause the size of the spinning cricket ball is quite appreciable ascompared to the distance through which the ball may turn on hitting theground.
(d) A beaker slipping off the edge of a table can not be considered as apoint object because the size of the beaker is not negligible as comparedto the height of the table.
(b) The monkey can be considered as a point object if the cyclist describesa circular track of very large radius because in that case the distancecovered by the cyclist is quite large as compared to the size of monkey.The monkey can not be considered as a point object if the cyclist describesa circular track of small radius because in that case the distance coveredby the cyclist is not very large as compared to the size of the monkey.
(c) The spinning cricket ball can not be considered as a point objectbecause the size of the spinning cricket ball is quite appreciable ascompared to the distance through which the ball may turn on hitting theground.
(d) A beaker slipping off the edge of a table can not be considered as apoint object because the size of the beaker is not negligible as comparedto the height of the table.
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